Tank thermostat tripping

Joined
18 Oct 2006
Messages
1,508
Reaction score
57
Location
Buckinghamshire
Country
United Kingdom
Moved in two days ago. Thermostat on the immersion heater has tripped twice. Works for a while when reset but the we runout of hot water.

Do we need a thermostat or an immersion heater and how do I tell?
 
Sponsored Links
Mine did the same, turned down the temperature setting, and been OK since. Yes, should fit a new thermostat, but if someone has turned it right up, then the reset may trip.
 
Set at about 50 degrees and the casing is marked as UKCA as well as CE so not very old.

Are they all fairly standard and if not what do I need to look for?
 
Do you own or rent the place? (Landlord responsible for repairing if you are not the owner, probably).

Do you only have electric for heating and hot water?

The thermostat is often replaceable separate from the immersion element... if you consider yourself competent to do so (leccy can be dangerous for the foolhardy). The element should not need replacing as it heats the water until the thermostat overheat trips...

Unless you mean a MCB or RCD in the consumer unit trips, of course.

Start with a pic of the item and maker / model numbers... they come in different lengths to suit position in tank and thermostat pocket they go in. The HW cylinder maker may have an installation and user manual that specifies the originally fitted parts.

https://www.heatingcontrolsonline.co.uk/immersion-heater-thermostats.html has some examples for you to see - also sold in places like Wickes, Toolstation, Screwfix and B&Q (probably).
 
Sponsored Links
The element should not need replacing as it heats the water until the thermostat overheat trips...
It should switch off on high temperature (without tripping anything) at lower than overheat trip setting. Sounds like the high temperature contacts are stuck together and the thermostat needs replacing.
 
It should switch off on high temperature (without tripping anything) at lower than overheat trip setting. Sounds like the high temperature contacts are stuck together and the thermostat needs replacing.
It being? the immersion element or the thermostat?

Also it won't be the ' high temperature contacts ' that have welded closed but the normal, variable temperature switch contacts. Then the resettable high temp switch opens...

Please don't very selectively quote me and then just confuse and give wrong information!!

My point was that the element is fine... Simples... in answer to that question in the OP.
 
It being? the immersion element or the thermostat?
The only time I used It is my first word. Obviously I mean the thermostat, that's where the switch contacts are, the element can't switch off by itself.
Also it won't be the ' high temperature contacts ' that have welded closed but the normal, variable temperature switch contacts. Then the resettable high temp switch opens...
When I said "It should switch off on high temperature (without tripping anything)" I think it's clear I meant the high point, not the high-high trip point, (to use common terminology). I included (without tripping anything) to make it unambiguous.
Please don't very selectively quote me and then just confuse and give wrong information!!
You said "....as it heats the water until the thermostat overheat trips..." At best that is misleading, it suggests that in normal operation heating stops when an upset happens (overheat) and requires manual reset. This is not the case.
You're the one giving confusing information, I'm trying to clarify things.

And do you really need to be so touchy over a thing like this?
 
Set at about 50 degrees and the casing is marked as UKCA as well as CE so not very old.

Are they all fairly standard and if not what do I need to look for?
You should hear a "click" each time you turn the stat setting up&down, ie turn it right down to its minimum setting then keep turning it up slowly until you hear a click, then very slowly turn it back down until you hear another click, should be around 5C/8C differential, the click when turning it up down should indicate the temperature in the cylinder where the stat is located.
 
Last edited:
The only time I used It is my first word. Obviously I mean the thermostat, that's where the switch contacts are, the element can't switch off by itself.
NOT OBVIOUS TO ME T***
When I said "It should switch off on high temperature (without tripping anything)" I think it's clear I meant the high point, not the high-high trip point, (to use common terminology). I included (without tripping anything) to make it unambiguous.
NOT CLEAR TO ME
You said "....as it heats the water until the thermostat overheat trips..." At best that is misleading, it suggests that in normal operation heating stops when an upset happens (overheat) and requires manual reset. This is not the case.
NO
You misread it and misunderstood completely.
I described what is (was by now I'd hope) happening in the situation NOT WHAT SHOULD HAPPEN IN NORMAL OPERATION
And do you really need to be so touchy over a thing like this?
YES I DO

When you selectively quote something I have written and then make rubbish comments. If you'd nit quoted me I'd have probably ignored your stupidity.
 
NOT OBVIOUS TO ME T***

NOT CLEAR TO ME

NO
You misread it and misunderstood completely.
I described what is (was by now I'd hope) happening in the situation NOT WHAT SHOULD HAPPEN IN NORMAL OPERATION

YES I DO

When you selectively quote something I have written and then make rubbish comments. If you'd nit quoted me I'd have probably ignored your stupidity.
You're pathetic. I won't bother commenting any further as you clearly won't understand. I'm sure you'll have a touch of lastworditis, feel free, I won';t be reading it.
 
Fitted a new thermostat Saturday and the new one is working.

Was a little suspicious that there was no click or resistance from the old one when I turned the temperature dial but the water didn’t seem inordinately hot either.

Now I know it was the star will take it apart and have a look.

Thanks for the help
 

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.


Are you a trade or supplier? You can create your listing free at DIYnot Local

 
Sponsored Links
Back
Top